t61p: How to check installed 4GB works?

[crg7]

Hello:

Have a t61p, bought in Jan 2007, no BIOS updates. Win-XP--32bit, SP3.
Added two 2GB Kingston chips a year apart---same model #, model specific RAM

How do I check that the two chips work together? I checked that each module by itself is recognized. With the two installed, even POST shows only 3GB.

Best

[Harryc]

With 32-bit Windows XP, don't expect to see more than 3.25 to 3.5 GB of useable memory, even if you have 4 GB of RAM.
If you run a 64bit OS your T61 can use all 4GB of RAM. So to answer your question directly, boot up a live version of a Linux 64bit Distro as a test. Then run a few commands to see what is being used.

[crg7]

Harry: Good idea. Let me check if I have a 64-bit Linux CD. I know that the usable memory is about 3GB and that is not an issue.

Is there another way of checking?

Best

[Harryc]

Just to see if it is working (as in functional), you can run memtest86.